Windows Account and Backdoor Creation
Creating a backdoor account gives you persistent access that survives payload restarts, AV detection, and service removal. A local or domain account with the right group memberships lets you authenticate via RDP, WinRM, or SMB at any point. This is the most straightforward persistence technique and the most visible — account creation is logged and monitored on hardened systems.
Local administrator account
Domain account persistence
On domain controllers or with Domain Admin privileges, creating a domain account gives access to any host in the domain. Adding it to Domain Admins is the most powerful option but also the most detectable.
Adding to Domain Admins generates event ID 4728 and is monitored in most environments. Account Operators can manage user accounts across the domain and is a less-monitored path to persistent influence. Backup Operators can log on locally to domain controllers and read any file.
Enable and repurpose existing accounts
Re-enabling a disabled account is less detectable than creating a new one because the account already exists in logs and monitoring baselines.
SSH authorized_keys on Windows
Windows 10 and Server 2019 ship with OpenSSH Server as an optional component. If it is installed and running, you can add an authorized key for persistent SSH access that does not rely on password authentication.
Cleaning up
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